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Related Experiment Video

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Induction of Adhesion-dependent Signals Using Low-intensity Ultrasound
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Low Intensity Pulsed Ultrasound for Bone Tissue Engineering.

Colleen McCarthy1, Gulden Camci-Unal1,2

  • 1Department of Chemical Engineering, University of Massachusetts Lowell, One University Avenue, Lowell, MA 01854, USA.

Micromachines
|December 24, 2021
PubMed
Summary

Low intensity pulsed ultrasound (LIPUS) effectively promotes bone formation in engineered scaffolds by enhancing cell activity and bone growth. This mechanical stimulation shows positive effects on cell behavior, mineralization, and osseointegration within various scaffold materials.

Keywords:
3D scaffoldsLIPUSbone tissue engineeringmechanotherapymechanotransduction

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Area of Science:

  • Biomaterials Engineering
  • Regenerative Medicine
  • Orthopedic Research

Background:

  • Mechanical stimulation, as per Wolff's law, is crucial for bone formation.
  • Low intensity pulsed ultrasound (LIPUS) provides mechanical stimulation, activating cellular pathways like integrin/PI3K/Akt.
  • LIPUS influences osteogenic protein production via COX-2 and PGE2.

Purpose of the Study:

  • To analyze the effects of LIPUS on cell behavior within 3D scaffolds (titanium, ceramic, hydrogel).
  • To evaluate LIPUS's impact on osteogenic differentiation, mineralization, and osseointegration.
  • To explore potential synergistic effects of LIPUS with scaffold properties and treatments.

Main Methods:

  • In vitro and in vivo studies were reviewed.
  • Analysis focused on cell morphology, attachment, proliferation, viability, osteogenic markers (ALP, osteocalcin), mineralization, bone volume, and osseointegration.
  • Scaffold types included titanium, ceramic, and hydrogel.

Main Results:

  • LIPUS demonstrated positive effects, promoting bone formation within engineered scaffolds.
  • Upregulated osteogenic markers (alkaline phosphatase, osteocalcin) and increased mineral deposition were observed.
  • Improved cell ingrowth, greater scaffold pore occupancy, and enhanced vascularization were noted.

Conclusions:

  • LIPUS generally enhances bone formation and osseointegration in 3D scaffolds.
  • Synergistic effects were observed with piezoelectricity, hydrogel encapsulation, growth factors, and scaffold modification.
  • Further research is needed to optimize LIPUS parameters and explore new material/cell combinations.